Laptop powers on and frequently there is no display. No option to select safe mode.
When I power on the laptop the power adaptor and CPU lights are on. The fan is running but there appears to be no CPU action taking place. There is nothing on the display not even a brand flash so there appears to be no way I can select safe mode. I can switch the laptop off (FN key and power button)multiple times and eventually the unit will power up and runs like a dream. I thought it may have been the CPU battery but I have left it running for several hours. Date and time are always correct. As soon as I close down the same problem occurs. I also tried using an external monitor only to find it responds the same way. It either works (rarely) or it doesn't. The laptop is never connected to the network or internet and has nothing new installed in the last 4 years. Could it still be theMB battery? Any ideas would be gratefully received. Thank you
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Re: Laptop powers on and frequently there is no display....
Check in the notebook power manager settings so that when you power off the laptop it does actually go off and not hibernate, and keep HDD powered on at all times and not set at power down after so many minutes.
There must be a power setting problem, so if you do get it going, check the settings.
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OverheatingWhen the CPU overheats then it will shut down (i.e. thermaloverload) and won't boot up again until it has cooled down. If this is theproblem is not fixed then the CPU will eventually fail. A faulty fan causes the problem or the fan and heat sink assembly are cloggedwith dust. Check the CPU fan to see if it spins freely, if not replace the fan. If the fan and heat sink is clogged with dust the remove the dust and make surethe vents are clear and dust free. Use a small brush and can of compressed airto do this.
1. power adaptor or battery isn't working - power problem. Some laptops require the battery to be in the machine even when it's running of the adaptor. If it runs out of 'juice' it will just go off suddenly.
2. overheating - It can get full of dust and dander and overheat the cpu which will also cause the machine to go off suddenly. It shuts off to protect the cpu from burning up. Sometimes if they get hot enough it can still take out the cpu... If the cpu fan stops working it will also overheat.
3. Control Panel - Power settings - check to see if there's a timer set to turn it off after so long etc.
Check the power adaptor led is not flashing. Flashing Adaptor LED indicates fault with laptop charging circuit / powerboard
If it will not boot on battery, and you know the adaptor to be good, the issue lies with the motherboard. Sometimes, removing the battery, and unplugging, pressing the power button and holding it for 30 secs, replacing the adaptor only will allow it to boot up, but this will only work if the motherboard is not damaged r the CPU fan has not failed.
When the laptop shuts down and you can't boot up until it has cooled down, then your notebook could have an overheating problem. The CPU shuts down when it overheats (thermal shutdown) and if this problem is not fixed the the CPU will eventually fail. The overheating problem could be caused by a faulty CPU fan or the fan and hear sink assembly is clogged with dust. Check the CPU fan and if is does not spin freely then it needs to be replaced. If the fan and heat sink is clogged with dust, then remove the dust, you can also use a can of compressed air to clear the dust from the heat sink fins.
The fan should have a red and black wire. You don't need the other one or two wires if there is (yellow/blue are for monitoring, if they are there).
The fan will take anywhere from 5V to 13V, so depending on how much noise you want you can change it.
As for the amperage, you want at least 1A. Most fans take 0.3A, but some powerful ones can take up to 0.6A. The quick easy route: Go with 12V and 1A., so 12W.
As for running them in parallel, sure you can. I've done it myself many times. Just match red with red and black with black, so that the endings are still just one black wire and one red wire. You can chain as many as you want, but add 1A for each fan.
I have more of a suspicion of the CPU fan than the hard drive, right now. If a hard drive goes bad, the system will wake up, go through it's POST (Power On Self Test), and then tell you there's an issue with the hard drive. If the CPU fan goes bad, the system turns on, sees an RPM of 0 on the fan, then turns back off. That hypothesis also fits in with the slowness you were seeing. If a CPU starts to overheat (because the fan isn't running well), it will start to throttle the clock speed down in an attempt to produce less heat. Unfortunately, it sounds like your laptop may be in need of a professional repair facility.